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Equity-Based Compensation - Schedule of Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 365 $ 380
Research and development expense    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense 96 44
General and administrative expense    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 269 $ 336